Fan



Jam 28, 1936. Q AI MAHON 2,028,985

FAN

Filed May 25, 1932 (/are ce /Z Mao/z ATTORNEY.

Patented Jan. 28, 193

FAN

Clarence A. Mahon, Kansas City, Mo. Application May 25, 1932, Serial No.613,425

2 Claims.

My invention relates to fans and particularly to those; for circulatingair in cooling, heating, or ltering systems and has for its principalobject to 'provide av circulatingunit having a fan ring so formed that aancan be rotatively mounted therein in a manner to prevent re-entry ofair into the ring, thereby eliminating eddy currents, or what iscommonly known as negative air now, around the ends of the fan blades,and materially increasing the flow of air from a fan.

A further 'object of the invention is to provide an outlet for the'cabinet embodying sound-absorbing qualities for decreasing the noisecreated by the fan and its driving motor.

In accomplishing theseand other objects of my invention, I have providedimproved details of structure, the preferred forms of which are shown inthe accompanying drawing, wherein:

Fig. l is an enlarged rear, elevational view of a circulating fan andits mounting, illustrating particularly the corresponding diameters ofthe fan v.and the small end of a funnel-shaped outlet opening. Y

. A Fig. 2 is a substantially central cross section on the line 2-2,Fig.Y 1.

Fig. 3 is a diagrammatic view illustrating the increased ow of air bythe induced draft created about the innersurface of the ring.

, Referring more in detail to the drawing:

I9 designates a perforated as shown at 2i and having its In order thatthe motor and fan may be con-v centrically, yet yieldingly, suspended inthe outlet, I preferably provide radial springs 30 connected at theirouter ends by hooks 3l and bolts 32 to the inner end plate 24 and havingtheir opposite into a mounting ring 34v surrounding the motor. Aplurality of 'set screws 35, arranged centrally be-- tween the eye bolts33, as best shown in Fig. 1, are threaded through the mounting ring intoengagement with the motor housing to provide for hunted radialadjustment of the motor in rela- .,endsv hooked in eye bolts 33 threadedtion to the ring.

Attention is directed-particularly to the fact that the fan 28 ispositioned in inwardly spacedrelation with the outer end of thefunnel-shaped outlet ring 20 and is of a diameter correspondingsubstantially to the small end of the outlet sol air into .that negativeair ow or back .iiow of circulating unit including a funnel-shapedoutlet or fan ring 28, preferably smaller end directed forwardly'withina hexagonal frame 23, including end plates 2 4 and 25 that are connectedwith the ends of the ring to provide a chamber which is 'lled with asound-absorbing material indicated at 26 so that noises created byoperation of a motor 21 and a fan or propeller 28 xed on a shaft 29 ofthe motor will penetrate the perforated funnel and be absorbed by thematerial (Cl. 23o-120) the cabinet is prevented by passage through theoutlet of a stream of air completely filling the outer end opening,

The increased diameter. of the inner end of the additional air at aslower velocity into the opening, thereby supplying air for an induceddraft extending beyond the end of the propeller to entirely eliminatenegative air flow and materially funnel-shaped opening further permitsintake of increase ow of air from the fan as shown by the 10 arrows inFig. 3. n

The novel formation of the outlet funnel ring 20 as .well as therelative diameters of the fan and outlet insures discharge of air in acontinucompletely till the small end of the outlet opening, therebypreventing return now of air.

The body of insulation 26 surrounding the outlet funnel is exposed toatmosphere by the perthe noise arising from the operation of the motorand the fan, although obviously the funnel-shaped outlet may be employedwithout the perforations and surrounding acoustical material underopernoise is not objectionable.

By provision of the mounting ring in adjustable relation to the motor,it is possible to mount the fan in accurate concentric alignment withthe port for absorbing vibrations of the fan and motor.

What I claim and desire to secure by Letters Patent is:

a propeller type fan, a cone-shaped ring having an air inlet at one endof larger diameter thanl the fan and having an air outlet at the otherend substantially equal to the diameter of the fan, and

the cone of the ring and in inwardly spaced relathe fan completely iillsthe air outlet to vprevent a propeller type fan, a cone-shapedperforated ring having an airinlet at one end of larger diameter thanthe fan and having an air outlet at the other end substantially equal tothe diameter of the fan, means supporting the fan concentrically withinthe cone of. the ring and in inwardly spaced relation to said air-outletwhereby the air without being cut ofi by the ring, and a sound absorbingmaterial encircling the ring and exposed through said periorations todeaden the sound of the air moving through the ring under the propellinginfluence of the fan.

tion to said air outlet whereby the air stream from eddy currentswithout being cut 01T by the ring. f 2. A device of the characterdescribed including 45 ous stream of suiiicient cross sectional area tol5 forations 2i in the funnel and absorbs much of 20` ating conditionswhere a moderate amount of '25 outlet of the ring and to produce aflexible sup- 30 1. A device of the character described including 35means supporting the fan concentrically within 40 stream from the fancompletely lls the air outlet CLARENCE A. MAHON.

